--- a/configure.ac
+++ b/configure.ac
@@ -149,9 +149,9 @@ GDnam=getdefs${ac_exeext}
 CLnam=columns${ac_exeext}
 if test "X$cross_compiling" = Xyes
 then
-  AGexe=`which ${AGnam}`
-  GDexe=`which ${GDnam}`
-  CLexe=`which ${CLnam}`
+  AGexe=`command -v ${AGnam}`
+  GDexe=`command -v ${GDnam}`
+  CLexe=`command -v ${CLnam}`
 else
   AGexe=${ag_top_builddir}/agen5/${AGnam}
   GDexe=${ag_top_builddir}/getdefs/${GDnam}